Peptide-N4-(N-acetyl-beta-glucosaminyl)asparagine amidase F cannot release glycans with fucose attached alpha 1----3 to the asparagine-linked N-acetylglucosamine residue

Eur J Biochem. 1991 Aug 1;199(3):647-52. doi: 10.1111/j.1432-1033.1991.tb16166.x.

Abstract

The ability of peptide-N4-(N-acetyl-beta-glucosaminyl)asparagine amidase F (PNGase F) from Flavobacterium meningosepticum and PNGase A from sweet almonds to deglycosylate N-glycopeptides and N-glycoproteins from plants was compared. Bromelain glycopeptide and horseradish peroxidase-C glycoprotein, which contain xylose linked beta 1----2 to beta-mannose and fucose linked alpha 1----3 to the innermost N-acetylglucosamine, were used as substrates. In contrast to PNGase A, the enzyme from F. meningosepticum did not act upon these substrates even at concentrations 100-fold higher than required for complete deglycosylation of commonly used standard substrates. After removal of alpha 1----3-linked fucose from the plant glycopeptide and glycoprotein by mild acid hydrolysis, they were readily degraded by PNGase F at moderate enzyme concentrations. Hence we conclude that alpha 1----3 fucosylation of the inner N-acetylglucosamine impedes the enzymatic action of PNGase F. Knowledge of this limitation of the deglycosylation potential of PNGase F may turn it from a pitfall into a useful experimental tool.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylglucosamine
  • Amidohydrolases / metabolism*
  • Asparagine
  • Carbohydrate Conformation
  • Carbohydrate Sequence
  • Flavobacterium / enzymology*
  • Fucose
  • Glycopeptides / metabolism
  • Glycoproteins / metabolism
  • Molecular Sequence Data
  • Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase
  • Substrate Specificity

Substances

  • Glycopeptides
  • Glycoproteins
  • Fucose
  • Asparagine
  • Amidohydrolases
  • Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase
  • Acetylglucosamine